Abstract
Efficiency and emissions of spark-ignited engines are significantly affected by combustion phase which can usually be indicated by crank angle of 50% mass burnt (CA50). Managing combustion phase at the optimal value at which the maximal efficiency can be achieved is a challenging issue due to the cyclic variations of combustion process. This paper addresses this issue in two loops: CA50 set-point optimization (outer loop) and set-point tracking (inner loop) by controlling spark advance (SA). Extremum seeking approach maximizing thermal efficiency is employed in the CA50 set-point optimization. A proportionalintegral (PI) controller is adopted to make the moving average value of CA50 tracking the optimal CA50 set-point determined in the outer loop. Moreover, in order to obtain fast responses at steady and transient operations, feed-forward maps are designed for extremum seeking controller and PI controller, respectively. Finally, experimental validations are conducted on a six-cylinder gasoline at steady and transient operations to show the effectiveness of proposed control scheme.
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This work was supported by Toyota Motor Corporation
Yahui ZHANG received the M.Sc. degree in Control Science and Engineering from Yanshan University, Qinhuangdao, China, in 2011. He is currently working toward the Ph.D. degree with the Department of Engineering and Applied Sciences, Sophia University, Tokyo, Japan. His current research interests include stochastic optimization, machine learning and application in automotive power train.
Tielong SHEN received the Ph.D. degree in Mechanical Engineering from Sophia University, Tokyo, Japan, in 1992. He has been a faculty member with the Department of Mechanical Engineering, Sophia University, since 1992, where he currently serves as a professor with the Department of Engineering and Applied Sciences. His current research interests include control theory and application in mechanical systems, power systems, and automotive power train.
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Zhang, Y., Shen, T. Cylinder pressure based combustion phase optimization and control in spark-ignited engines. Control Theory Technol. 15, 83–91 (2017). https://doi.org/10.1007/s11768-017-6175-1
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DOI: https://doi.org/10.1007/s11768-017-6175-1